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Reference Terms
from Wikipedia, the free encyclopedia

Galaxy

A galaxy is a massive, gravitationally bound system consisting of stars, an interstellar medium of gas and dust, and dark matter.

Note:The above text is excerpted from the Wikipedia article "Galaxy", which has been released under theGNU Free Documentation License.
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Space & Time News
July 28, 2023

Listen to a Star 'Twinkle'

Many people know that stars appear to twinkle because our atmosphere bends starlight as it travels to Earth. But stars also have an innate 'twinkle' -- caused by rippling waves of gas on their surfaces -- that is imperceptible to current Earth-bound telescopes. In a new study, researchers developed ...

New Study Reveals Evidence of Diverse Organic Material on Mars

科学家获得vital insights into Mars' history and potential for supporting ...

First 'Ghost Particle' Image of Milky Way

Scientists have revealed a uniquely different image of our galaxy by determining the galactic origin of thousands of neutrinos -- invisible 'ghost particles' which exist in great quantities but normally pass straight through Earth undetected. The neutrino-based image of the Milky Way is the first ...

Earliest Strands of the Cosmic Web

Galaxies are not scattered randomly across the universe. They gather together not only into clusters, but into vast interconnected filamentary structures with gigantic barren voids in between. This 'cosmic web' started out tenuous and became more distinct over time as gravity drew matter ...
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